| 摘要 |
An adjustable wrench has a body, a movable jaw, a pinion assembly, a sliding rack and a positioning device. The pinion assembly has a first pinion corresponding to and engaging the sliding rack and a second pinion engaging the first pinion and the movable jaw. Thereby, the pinion assembly transversely extends or retracts the movable jaw quickly when the sliding rack is moved longitudinally. Moreover, the positioning device locks the sliding rack in position to keep the movable jaw stable during use.
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